clocksource: timer-keystone: Delete unnecessary variable

Commit 438e0bff5257 added the timer-keystone device driver but make use
of an unnecessary variable in the init function. This patch deletes this
variable.
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

drivers/clocksource/timer-keystone.c

@@ -164,7 +164,6 @@ static void __init keystone_timer_init(struct device_node *np)
 	unsigned long rate;
 	struct clk *clk;
 	int irq, error;
-	u32 tgcr;
 
 	irq  = irq_of_parse_and_map(np, 0);
 	if (irq == NO_IRQ) {
@@ -199,12 +198,10 @@ static void __init keystone_timer_init(struct device_node *np)
 	keystone_timer_barrier();
 
 	/* reset timer as 64-bit, no pre-scaler, plus features are disabled */
-	tgcr = 0;
 	keystone_timer_writel(0, TGCR);
 
 	/* unreset timer */
-	tgcr |= TGCR_TIM_UNRESET_MASK;
-	keystone_timer_writel(tgcr, TGCR);
+	keystone_timer_writel(TGCR_TIM_UNRESET_MASK, TGCR);
 
 	/* init counter to zero */
 	keystone_timer_writel(0, TIM12);